Motor-controller.



A. SIMON.

MOTOR CONTROLLER.

APPLICATION FILED MAY 20. 1914.

1,299,248. Pat ente d Apr. 1,1919.

W565. r w Mr UNITED STATES PATENT OFFICE.

ARTHUR SIMbN, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER-HAMMERMFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

itoTon.-oomaoLLrai.

Specification of Letters Patent.

Application filed May 20, 1914. Serial No. 839,795.

. and is particularly applicableto potential controllers for alternatingcurrent motors, sucln for example, as the controller disclosed in myprior Patent No. 985,215, granted Feb. 25, 1911. f

The invention has among its objects to provide a multiple switchpotential controller for alternating current-motors which will maintaincontinuity of the motor circuit during the regulation of potential.

A further object is to provide a controller of the aforesaid characterwith means to arrest the operation of the potential regulating switchesupon the occurrence of abnormal conditions in the motor circuit.

Various other objects and advantages of the invention will hereinafterappear.

To more clearly and fully disclose the nature and advantages of thepresent invention, one embodiment thereof has been diagrammaticallvillustrated in the accompanying drawing, it, of course, being understoodthat various modifications may be made in the controller illustratedwithout departing from the scope of the appended claims.

The controller is illustrated as governing a single phase alternatingcurrent motor M through the medium of an auto-transformer T. Brieflydescribed, the controller includes a plurality of electromagneticswitches operating in progression to first connect the auto-transformerT in circuit and then connect the motor'to different taps of thetransformer, and upon changing from each tap to the 4 next, establishingconnections to maintain continuity of the motor circuit in the interim.Also, current relays are provided to check the progressive operation ofthe switches whenever the current in the motor circuit exceeds a certainvalue. 0

More specifically, the controller includes a magnetic switch 1controlling the circuit of the transformer T. magnetic switches 2, 3 and4 to progressively connect the motor to different taps of thetransformer and directly to the line, magnetic switches 5 and 6 toestablish transition connections for the motor and current relayswitches 3, 4, 5

and (3 controlling the energizing circuits of so the switches 3, 4, 5and 6 respectively.

The switches 1, 2, 5, 3, 6 and 4: are interconnected through auxiliarycontacts hereinafter described to respond in the order named uponclosure of a control switch 7 65.

and to thereafter act as follows: The switch 1 remains closed untiloperation of switch 4. The switch 2, connecting the motor to the firsttap of the transformer, opens prior to closure of the switch 3,connecting the motor to the second tap of the transformer and the switch3 in turn opens prior to response of the switch 4, which connects themotor directly to the line. The switch 2,

however, remains closed until response of the switch 5, which latterswitch connects the second tap of the transformer to the motor through aresistance R. Switch 5 remains closed until response of the switch 3 andthen automatically opens. The switch 6 functions with respect to theswitches 3 and 4 in the same manner as switch 5 functions with respectto the switches 2 and 3. Thus, in the interval between the opening ofthe switch 2 and the closure of the switch.

3 the continuity of the motor circuit is maintained by the switch 5through the resistance R, and likewise during the interval between theopening of switch 3 and the closure of switch 4 the continuity of themotor circuit is maintained by the switch -6 through the resistance R.

The current relay 5 is connected in circuit upon closure of switch 2 andupon response delays closure'of the energizing ciroperation of switches3, 6 and 4 in the man ner described.

The circuit arrangement and operation of the controller will now be morespecifically described.] When switch 7 is closed circuit is completedfrom line L by conductor 8 through said switch, by conductor 9 throughdown contacts @of switch 4:, by

, Patented Apr. 1, 1919.

The relays 3, 100 6* and 4 are similarly controlled by the switches 5, 3and 6 respectively to govern the switch 1 completes circuit fromOperating winding of switch 2, to conductor 14 and thence to line L.Switch 2 thereupon responds, connecting the motor in circuit.

The motor is permanently connected to line L and upon response of switch2 it is hand tap of the transformer.

- 19 through relay switch 5,

ductor 27 through down contacts 2 to conductor 33 through the windingof.

cludes tacts 3 parallels the also connected by conductor through switch2, by conductor 16 through the winding of relay 5*, by conductor 17 tothe right It is thereby started but with a low potential impressedthereon.

Switch 2 upon responding, also completes circuit from conductor 11 byconductor 18 through a set of up contacts 2*, by conductor by conductor20 through down contacts 3 of switch 3, by conductor 21 through thewinding oil switch 5 to conductor 14 and thence to line 1.1 Switch 5thereupon responds subject to retardation by response of relay switchSwitch 5 when closed establishes a connection for the motor fromconductor 15 through resistance R, by conductor 22 to conductor 23through the winding of relay 3 by conductors 2 2 and 25 to the secondtap or the transformer. This constitutes one or the temporaryconnections for the motor,

and as soon as the same is established the switch 2 is deenergized bythe opening of the auxiliary contacts 5 of switch 5.. This leaves themotor with only the temporary connection aforesaid, the switch 5 beingmaintained closed by its auxiliary contacts 5 in parallel with contacts2* or" switch 2.

Switch 2 upon opening completes the energizing circuit or switch 3. Thiscircuit extends "from conductor lliby conductor 26 through up contacts 5of switch 5, by con;E

switch 2, by conductor 28 through the relay switch 3, by conductor 29through down contacts 6 of switch 6, byconductor 30 through the windingof switch 3'to conductor 14 and thence to line L.

Switch 3 thus responds subject to retardation by relay 3 and uponresponding connects the motor lead 15 by conductor 32 relay 6 to taplead 25. lit therefore ex- R. Also, switch 3 by the opening of itsauxiliary contacts 3 deenergizes switch 5 while by the closure of itsauxiliary concontacts- 5 and thus establishes a maintaining circuit foritself. Further, by closure of contacts 3" it comthrough down contactsfrom the motor circuit the resistance completing circuit to resistanceand pletes the energizing circuit of switch 6, assuming the switch 5 tobe returned to normal position to close its contacts 5".

The ener -gizing circuit of switch 6 extends from conductor 11- throughthe down contacts 5 of switch 5, by conductors 35 and 36 through upcontacts 3 of switch 3, by'conductor 37 through relay switch 6, byconductor 38 through down contacts t of switch 4, by conductor 39through the winding of switch 6 to conductor 1% and thence to line L.Switch 6 thereupon responds, subject to retardation by relay 6 and uponresponding connects the motor lead 15 through resistance R by conductorll) to conductor ll, through by conductor 42 to line L. This, as will beunderstood, constitutes another temporary connection and as soon as thesame is established switch 3 is deenergized'by thethe winding of relay tductor 11 through said contacts 3, by l conductor 43 through saidcontacts 6, by

conductor 44 through relay switchd b conductor 45 through the winding ofswitc d to conductor 14: and line L. Switch 4: thereupon responds,subject to retardation by the relay 4: and upon closing completescircuit directly from conductor l2 to motor lead 15 for maximumpotential.

Switch t when closed also establishes a maintaining circuitior itselithrough up contacts 4& and by opening of down contacts 4* and 4deenergizes switches 1 and 6 respectively. The motor is thus connecteddirectly across the lines by a single switch and all remaining switchesare opened.

What I claim as new and desire to secure by Letters Patent is:

1. In a controller for motors, the combination with a transformer, of aplurality or": separately actuate-d switches automatically operable inprogression, a resistance, the first switch of the progressioncompleting circuit to one tap of the trans former, the second com letingcircuit to another tap of the transtor'mer through said resistance andthe third completing a circuit for the latter tap exclusive of saidresistance.

2. In a controller for alternating current motors, the combination witha transformer, of a plurality of separately actuated switchesautomatically operable in progression, a resistance, the first switch ofthe progression former, the second completing circuit to another tap ofthe trans ormer through said the third completing a circuit one tap ofthe transfor the latter tap exclusive of said resistance, and means tocheck the progressive operation of said switches under abnormalelectrical conditions.

3. In a controller for alternating current motors, the combination witha transformer,

of a plurality of separately'actuated switches operable in progression,a resistance, the first switch of said progression completing circuit toone tap of the transformer, the second completing circuit to another tapof the transformer, through said resistance, and the third completingcircuit to said second tap exclusive of said resistance, said firstswitch being restored to initial position upon operation of said secondswitch and said second switch being restored to initial position uponoperation of said third switch.

4. In a controller for alternating current motors, the combination witha transformer, of a plurality of separately actuated swimhe operable inprogression, a resistance, the first switch of said progressioncompleting circuit to one tap of the transformer, the second completingcircuit to another tap of the transformer, through said resistance, andthe third completing circuit to said second tap exclusive of saidresistance, said first switch being restored to initial position uponoperation of said second switch and said second switch being restored toinitial position upon operation of said third switch and means to checkthe progressive operation of'said switches under abnormal electricalconditions.

5. In a controller for alternating current motors, Lin combination, atransformer, a plurality of switches operable in progression and eachupon operatingeli'ecting restoration of the .precedin switch to initialvposition, connections tween alternate switches of the aforesaidprogression and different taps of said transformer and resistance shuntsaround certain of said alternate switches controlled by the switches.

next preceding the same in the aforesaid progression.

6. In a controller for alternating current motors, in combination, atransformer, a plurality of switches operable in progression and eachupon operating efiecting restoration. of the preceding switch to initialposition, connections between alternate switches of the aforesaidprogression and different taps of said transformer, a resist ance, andconnections whereby other switches of the aforesaid progremion completecircuit to the different taps of the "transformer through the aforesaidresistance for maintaining the continuity of the motor circuit duringtransition of connections by said first mentioned switches.

7. In a motor dint/roller, in combination, a plurality of progressivelyoperable potential regulating switches each to be restored to initialposition prior to operation of the next switch in progression and aplurality of switches operable progressively and alternately withrespect to said former switches to establish transition connections.

8. In a motor controller, in combination, a plurality of progressivelyoperable potential regulating switches each to be restored to initialposition prior to operation of the next switch in regression, aplurality of switches operab e progressively and alternately withrespect to said former switches to establish transition connections, andmeans responsive to the current in the motor circuit to check theoperation of the aforesaid switches under abnormal conditions.

9.'In a motor controller, in combination, a plurality of progressivelyoperable potential re ulating switches each to be restored to initialposition prior to operation of the next in progression, a plurality ofswitches operable progressively and alternately with respect to saidformer switches to establish transition connections, and a plurality ofdevices responsive to the electrical conditions in the motor circuit,each of said devices upon responding temporarily checking the operationof one of said switches.

10. In a motor controller, in combination, a plurality of progressivelyoperable switches, potential regulating means controlled by alternateswitches of the aforesaid progression and transition connectionscontrolled by other switches of the aforesaid progression, each of saidswitches returning to initial position upon operation of the nextsucceeding switch.

11. In a motor controller, in combination, a plurality of progressivelyoperable switches, potential regulatin means controlled by alternateswitches o the aforesaid progression and transition connectionscontrolled by other switches of the aforesaid progression, each of saidswitches returning to initial position upon operation of the nextsucceeding switch, and means responsive to the current conditions in themotor circuit to arrest the progressive operation of said switches underpredetermined conditions.

12. In a motor controller, in combination, a plurality of potentialregulating switches to operate in progression and each to return toinitial position prior tooperation of the next in progression andtending when opened to interrupt the motor circuit, and

means for maintaining the continuit of the regulating switches operablein progression and each returning to initial position prior to operationoi the next in progression, and electro-responsive means to establishtempoand each returning to rary motor connections durin the variationsin connections by said switc es.

- 14, y In a motor controller, in combination, a plurality ofelectro-responsive potential regulating switches operating inprogression and each returning to initial position prior to operation ofthe next in rogression and means operating automatica ly prior to thereturn of each of said switches to establish temporary motor connectionsand upon operation of the following switch operating automatically tointerrupt said temporary connections.

15. In a motor controller, in combination, a plurality ofelectro-responsive potential regulating switches operatin in progressionand each returning to initia position prior to operation of the next inprogression, means operating automatically prior to the return of eachof said switches to establish temporary motor connections and uponoperation of the following switch operating automatically to interruptsaid temporary connection, and means responsive to the currentconditions in the motor circuit for arresting the pro essive operationof said switches under a normal conditions.

16. In a motor controller, in combination, a plurality ofelectro-responsive potential regulating switches operatin initiaposition prior to operation of the next in progression and a pluralityof ele'ctro-responsive switches to establish temporary connections forthe motor, each of said second mentioned switches operatingautomatically upon operation of a corresponding potential regulatingswitch and returning to initial position upon operation of the nextpotential regulating switch.

17. in a controller for alternating current motors, in combination, atransformer, a plurality of switches operable automatically andprogressively to connect said transformer in circuit, then establishmotor connections-to said transformer and finally to in progression theline, means to establish-temporary motor connections in the intervalsbetween the establishment of the aforesaid connections, and meanswhereby the switch controllin the transformer circuit is restored toinitia position upon establishment of the motorconnections to the line.

18. In a motor controller, two electro-responsive control switches, oneto close and open prior to the closure of the other and the former uponopening tending to interrupt the motor circuit, and electroresponsivemeans operating aftejr closure of said first switch to' maintain thecontinuity of the motor circuit in the interval between the opening ofsaid first switch and the closure of said second switch. l

, 19. In a motor controller, in combination, two electro-responsivecontrol switches, one

to close and open prior to the closure of the 85 other and the formerupon opening tending to interrupt the motor circuit, andelectroresponsive means operating after closure of said first switch tomaintain of the motor circuit in the interval between the opening ofsaid first switch and the closure of said automatically to upon theclosure of said second switch.

20. In a motor controller, in combination, three switches, meanseffecting automatic closure thereof progressively, opening of the firstsubse uent to closure of the second and o ening o the second uponclosure of the t ird and connections established by said second switchto maintain the continuity of the motor circuit during the change of.connections by said first and third switches.

In witness whereof, I have hereunto subscribed my name in the presenceof two witnesses.

ARTHUR SIMON.

Witnesses: v

C. '1, Evans,

L. A. WATSON.

in combination, 4

the continuity

